Matthew 2: 1-2
Now when Jesus was born in Bethlehem of Judæa in the days of Herod the king, behold, there came wise men from the east to Jerusalem,
Saying, Where is he that is born King of the Jews? for we have seen his star in the east, and are come to worship him.
And behold, there shall a new star arise, such an one as ye never have beheld; and this also shall be a sign unto you.
3 Nephi 1:21
And it came to pass also that a new star did appear, according to the word.
How did the Wiseman know that Jesus had been born?